Weyl formulas for annular ray-splitting billiards

We consider the distribution of eigenvalues for the wave equation in annular (electromagnetic or acoustic) ray-splitting billiards. These systems are interesting in that the derivation of the associated smoothed spectral counting function can be considered as a canonical problem. This is achieved by extending a formalism developed by Berry and Howls for ordinary (without ray-splitting) billiards. Our results are confirmed by numerical computations and permit us to infer a set of rules useful in order to obtain Weyl formulas for more general ray-splitting billiards

Effect of a boron implantation on the electrical properties of epitaxial HgCdTe with different material composition

In this work the experimental results of investigations of the dynamics of accumulation and spatial distribution of electrically active radiation defects when irradiating epitaxial films of Hg1-xCdxTe (MCT) with different material composition (x). The films, grown by molecular beam epitaxy (MBE) were irradiated by B ions at room temperature in the radiation dose range 1012 -1015 ions/cm2 and with ion energy 100 keV. The results give the differences in implantation profiles, damage accumulation and electrical properties as a function of the material composition of the film

Accumulation and annealing of radiation donor defects in arsenic-implanted Hg0.7Cd0.3Te films

Processes of accumulation and annealing of radiation-induced donor defects in arsenic-implanted Hg0.7Cd0.3Te films were studied with the use of the Hall-effect measurements with processing the data with mobility spectrum analysis. A substantial difference in the effects of arsenic implantation and post-implantation activation annealing on the properties of implanted layers and photodiode ‘base’ layers in Hg0.7Cd0.3Te and Hg0.8Cd0.2Te films was established and tentatively explained

Localization and nature of radiation donor defects in the arsenic implanted CdHgTe films grown by MBE

By profiling the electrical parameters of the arsenic implanted CdHgTe films, grown by molecular bea

Fluence dependence of nanosize defect layers in arsenic implanted HgCdTe epitaxial films studied with TEM/HRTEM

We report on the results of comparative study of fluence dependence of defect layers in molecular-beam epitaxy-grown epitaxial film of p-Hg1-х CdхTe (х=0.22) implanted with arsenic ions with 190 keV energy and fluence 1012, 1013, and 1014 cm-2

Analysis of the Basidiomycete Coprinopsis cinerea Reveals Conservation of the Core Meiotic Expression Program over Half a Billion Years of Evolution

Coprinopsis cinerea (also known as Coprinus cinereus) is a multicellular basidiomycete mushroom particularly suited to the study of meiosis due to its synchronous meiotic development and prolonged prophase. We examined the 15-hour meiotic transcriptional program of C. cinerea, encompassing time points prior to haploid nuclear fusion though tetrad formation, using a 70-mer oligonucleotide microarray. As with other organisms, a large proportion (∼20%) of genes are differentially regulated during this developmental process, with successive waves of transcription apparent in nine transcriptional clusters, including one enriched for meiotic functions. C. cinerea and the fungi Saccharomyces cerevisiae and Schizosaccharomyces pombe diverged ∼500–900 million years ago, permitting a comparison of transcriptional programs across a broad evolutionary time scale. Previous studies of S. cerevisiae and S. pombe compared genes that were induced upon entry into meiosis; inclusion of C. cinerea data indicates that meiotic genes are more conserved in their patterns of induction across species than genes not known to be meiotic. In addition, we found that meiotic genes are significantly more conserved in their transcript profiles than genes not known to be meiotic, which indicates a remarkable conservation of the meiotic process across evolutionarily distant organisms. Overall, meiotic function genes are more conserved in both induction and transcript profile than genes not known to be meiotic. However, of 50 meiotic function genes that were co-induced in all three species, 41 transcript profiles were well-correlated in at least two of the three species, but only a single gene (rad50) exhibited coordinated induction and well-correlated transcript profiles in all three species, indicating that co-induction does not necessarily predict correlated expression or vice versa. Differences may reflect differences in meiotic mechanisms or new roles for paralogs. Similarities in induction, transcript profiles, or both, should contribute to gene discovery for orthologs without currently characterized meiotic roles

Конструктивне рішення підводної частини малоповерхових житлових будинків на воді

The paper presents a structural solution of a pontoon-module for construction of floating platforms which could be used as underwater part of low-rise residential floating houses and also for pontoon bridges, mooring lines and other types of floating structures.В статье описано конструктивное решение понтона-модуля для строительства плавучих платформ, которые могут использоваться в качестве подводной части малоэтажных жилых зданий на воде, а также для устройства наплавных мостов, причальных и других типов плавучих сооружений.У статті описано конструктивне рішення понтона-модуля для будівництва плавучих платформ, які можуть використовуватися в якості підводної частини малоповерхових житлових будинків на воді, а також для влаштування наплавних мостів, причальних і інших типів плавучих споруд

Морозостійкість бетонів на дрібних дніпровських пісках

The results of experimental studies of freeze resistance of concrete with fine Dnipro sands are given. It was found that with proper selection of compositions using additives fine Dnipro sands can be used. Such compositions provide concrete mark of freeze resistance F300, F400.Приводятся результаты экспериментальных исследований морозостойкости бетонов на мелких днепровских песках. Установлено, что при правильном подборе составов с применением добавок можно использовать мелкие днепровские пески. Такие составы бетонов обеспечивают марку по морозостойкости F300, F400.Наводяться результати експериментальних досліджень морозостійкості бетонів на дрібних дніпровських пісках. Встановлено, що при правильному підборі складів із застосуванням добавок можна використовувати дрібні дніпровські піски. Такі склади бетонів забезпечують марку по морозостійкості F300, F400

Структурна міцність золобетонов

It is proved that the most important feature of freshly-moulded by vacuumizing ash concrete is its high structural strength at capillary compression of solid phase by tempering water (liquid phase). In absolute terms it is 5...6 times greater than in vibrocompacted ash concrete from stiff mix at the same W/C and cementconsumption. This significantly increases reliability of the technology when forming structures from vacuum ash concrete with immediate dismantling. With such technology vacuum ash concrete has strength at the age of 28 days 50...56% more in comparison with vibrocompacted ash concrete from stiff mix. It ensures considerable cement saving when obtaining concretes of the same strength.Доказано, что важнейшей особенностью свежеотформованного вакуумированием золобетона является его высокая структурная прочность за счет капиллярного обжатия твердой фазы водой затворения (жидкой фазой). По абсолютным показателям она является в 5…6 раз большей, чем у виброуплотненного золобетона из жесткой смеси при тех же В/Ц и расходах цемента. Это существенно повышает надежность технологии при формовании конструкции из вакуумзолобетонов с немедленной распалубкой. При такой технологии вакуумированный золобетон имеет прочность в 28-ми суточном возрасте на 50…56% большую в сравнении с виброуплотненным золобетонном из жесткой смеси. Это обеспечивает значительную экономию цемента при получении равнопрочных бетонов.Доведено, що найважливішою особливістю свежеотформованного вакуумированием золобетона є його висока структурна міцність за рахунок капілярного обтиску твердої фази водою замішування (рідкої фазою). За абсолютними показниками вона є в 5 ... 6 разів більшою, ніж у віброущільненням золобетона з жорсткою суміші при тих же В / Ц і витратах цементу. Це істотно підвищує надійність технології при формуванні конструкції з вакуумзолобетонов з негайною розпалубкою. При такій технології вакуумований золобетон має міцність в 28-ми добовому віці на 50 ... 56% більшу в порівнянні з віброущільненням золобетонном з жорсткою суміші. Це забезпечує значну економію цементу при отриманні равнопрочних бетонів

Nodal Domains in Chaotic Microwave Rough Billiards with and without Ray-Splitting Properties

We study experimentally nodal domains of wave functions (electric field distributions) lying in the regime of Breit-Wigner ergodicity in the chaotic microwave half-circular ray-splitting rough billiard. Using the rough billiard without ray-splitting properties we also study the wave functions lying in the regime of Shnirelman ergodicity. The wave functions Ψ$\text{}_{N}$ of the ray-splitting billiard were measured up to the level number N=204. In the case of the rough billiard without ray-splitting properties, the wave functions were measured up to N=435. We show that in the regime of Breit-Wigner ergodicity most of wave functions are delocalized in the n, l basis. In the regime of Shnirelman ergodicity wave functions are homogeneously distributed over the whole energy surface. For such wave functions, lying both in the regimes of Breit-Wigner and Shnirelman ergodicity, the dependence of the number of nodal domains Ɲ$\text{}_{N}$ on the level number N was found. We show that in the regimes of Breit-Wigner and Shnirelman ergodicity least squares fits of the experimental data reveal the numbers of nodal domains that in the asymptotic limit N→∞ coincide within the error limits with the theoretical predictionƝ$\text{}_{N}$/N≃ 0.062. Finally, we demonstrate that the signed area distribution Σ$\text{}_{A}$ can be used as a useful criterion of quantum chaos